SANTA CLARA, CA - MAY 01: Michael Crabtree #15 of the San Francisco 49ers looks on at practice during the 49ers Minicamp at their training facilities on May 1, 2009 in Santa Clara, California. Crabtree was the 49ers first round draft pick. (Photo by Jed Jacobsohn/Getty Images)

As far as the coaches and players are concerned, a game on Dec. 20 might as well be, like, four months from now or something.

In other words, Michael Vicksigning with the Philadelphia Eagles did not send the 49ers into "We have got to game plan for this guy RIGHT NOW!" mode regarding their game at Philadelphia's Lincoln Financial Field. To the contrary.

"Right now, we're just trying to get through training camp," defensive coordinator Greg Manuskysaid. "When we get there, I'll probably have to figure out a way (to game-plan for him.) I don't even know when we play them."

In the third week of August, linebacker Takeo Spikesis not concerning himself with the possibility of Vick whipping around end on a run from the Eagles' Wildcat formation in the third week of December.

"Nah. To be honest with you, I'm not even worried about it," Spikes said after Monday morning's practice. "It's too far down the road to consider. But now that you bring it up, I'm looking forward to going to one of my favorite restaurants there, La Veranda."

Likewise, cornerback Nate Clementsis not staying up nights with visions of Vick running free in the open field. With the Buffalo Bills, Clements played Vick and the Atlanta Falcons twice and lost both times.

"I'm happy for Mike. I'm glad he got picked up," Clements said. "I'm more happy for him than anything else. The time (Dec. 20) will come, but not right now."

Defensive end Justin Smithis another Niner not fretting in August about the possibility of playing against Vick in December.

Willis returns: After missing 21 practices with a sprained right ankle and a sore right Achilles tendon, linebacker Patrick Williswas back to work Monday morning, although he was limited to individual drills.

The team hadn't acknowledged that Willis had a sore Achilles and said only that he had a "mild" ankle strain at the time of the injury.

Willis hurt the ankle and Achilles in the first practice of camp, Aug. 1, in an encounter with running back Michael Robinsonin the "nutcracker" drill. Starting left guard David Baaswas also hurt in the "nutcracker" and has not returned to practice with a foot strain.

"It's been real frustrating but at the same time, it's been good," Willis said. "I've been playing it safe, not rushing it. It was just sore, more aggravating than anything else."

If the injury had happened during the regular season, Willis said he would not have missed any games. He doesn't know if he'll play against the Raiders on Saturday night.

Napa time: The 49ers will be in Napa today and Wednesday for a series of four practice sessions with the Raiders.

"The nice thing for a quarterback is for two weeks we've been seeing the same look," Alex Smith said. "It'll be nice to go up there and see some different defensive backs. It breaks up camp. Changing things up is nice."

However, Spikes groused about the setup, saying, "It probably wouldn't be bad if we weren't playing them three days later. I don't like the fact you've got to practice against them two days in a row and then play them."

Briefly: Tight end Delanie Walkerwas cleared to practice after missing time recovering from a concussion. ... Cornerback Tarell Brown(toe) returned to practice. ... Linebacker Jeff Ulbrichsat out most of the morning practice with a sore groin. ... Coming off a groin strain, Robinson was limited to individual work.